K3 and IC- 2KL; negative voltage modification

[OE5CSP-Chris]

Guys,

Does anybody here use the K3 with the IC-2kl amp? Is the negative ALC modifcation really necessary?

73, Chris-OE5CSP

[David Cutter]

When I get around to joining mine together, I will not use ALC.

David
G3UNA

>
> Guys,
>
> Does anybody here use the K3 with the IC-2kl amp? Is the negative ALC
> modifcation really necessary?
>
> 73, Chris-OE5CSP
> --
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[OE5CSP-Chris]

-------- Original-Nachricht --------
> Datum: Fri, 5 Dec 2008 00:44:06 -0800 (PST)
> Von: "David Cutter (via Nabble)" <[hidden email]>
> An: OE5CSP-Chris <[hidden email]>
> Betreff: Re: [Elecraft] K3 and IC- 2KL; negative voltage modification

>
>
>
> When I get around to joining mine together, I will not use ALC.
>
> David
> G3UNA
>

Hi David!

Thanks for your reply. I use this amp with my IC 761, but the K3 is much better cw rig.I guess you haven´t tried to connect the K3 with the amp, have you?

73, Chris-OE5CSP

--
Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger

[Ron N9RC]

I use the K3 with a 2KL.  I have the parts for auto band switching (decade band info convertor) but have yet to build it.  The max power setting I use is 25 watts for 500 watts out but have to watch the K3 power closely.  The 2KL trips out easily when over driven and depending on band, mode and antenna SWR (worst case 1.5:1) I have to reduce the K3 power to as much as 12 watts to avoid trips.  I believe the K3 "may" have  a power spike on first sylable that causes some of the trips.  I do not use ALC but as things settle I may try it.  I use the MFJ 600 watt auto tuner with the 2KL and generally it works quite well.  I was not happy with a AT-500 I had.

Ron, N9RC

OE5CSP-Chris wrote

Guys,

Does anybody here use the K3 with the IC-2kl amp? Is the negative ALC modifcation really necessary?

73, Chris-OE5CSP

[OE5CSP-Chris]

-------- Original-Nachricht --------
> Datum: Fri, 5 Dec 2008 04:56:09 -0800 (PST)
> Von: "Ron N9RC (via Nabble)" <[hidden email]>
> An: OE5CSP-Chris <[hidden email]>
> Betreff: Re: [Elecraft] K3 and IC- 2KL; negative voltage modification

>
>
>
> I use the K3 with a 2KL.  I have the parts for auto band switching (decade
> band info convertor) but have yet to build it.  The max power setting I
> use
> is 25 watts for 500 watts out but have to watch the K3 power closely.  The
> 2KL trips out easily when over driven and depending on band, mode and
> antenna SWR (worst case 1.5:1) I have to reduce the K3 power to as much as
> 12 watts to avoid trips.  I believe the K3 "may" have  a power spike on
> first sylable that causes some of the trips.  I do not use ALC but as
> things
> settle I may try it.  I use the MFJ 600 watt auto tuner with the 2KL and
> generally it works quite well.  I was not happy with a AT-500 I had.
>
> Ron, N9RC
>
>

Hi Ron,

Thanks for your reply!

Which kind of band decoder are you using? How did you connect your K3 with the 2KL? I guess with a single cable from the key out (K3) to the T/R control terminal, right? I´m a bit scared of harming the K3 or 2KL, because of wrong connections. Is there anything else I have to think of?

I´m also using the AT 500 tuner and I sometimes have problems too. Sometimes the tuner does not want to tune at all, so I use a little trick. I engage the internal IC 761 tuner and then the AT500 starts tuning. I turn the internal tuner off and everything works fine.


73, Chris-OE5CSP
--
Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger

[chen dave]

I use IC-2KL and K3 in home, only use PTT cable. 40-50w to get 500w output.
no problem at all.

73 de ba4rf/David

On Sat, Dec 6, 2008 at 7:54 PM, OE5CSP-Chris <[hidden email]> wrote:

-------- Original-Nachricht --------
> Datum: Fri, 5 Dec 2008 04:56:09 -0800 (PST)
> Von: "Ron N9RC (via Nabble)" <[hidden email]>

> An: OE5CSP-Chris <[hidden email]>

> Betreff: Re: [Elecraft] K3 and IC- 2KL; negative voltage modification

>
>
>
> I use the K3 with a 2KL.  I have the parts for auto band switching (decade
> band info convertor) but have yet to build it.  The max power setting I
> use
> is 25 watts for 500 watts out but have to watch the K3 power closely.  The
> 2KL trips out easily when over driven and depending on band, mode and
> antenna SWR (worst case 1.5:1) I have to reduce the K3 power to as much as
> 12 watts to avoid trips.  I believe the K3 "may" have  a power spike on
> first sylable that causes some of the trips.  I do not use ALC but as
> things
> settle I may try it.  I use the MFJ 600 watt auto tuner with the 2KL and
> generally it works quite well.  I was not happy with a AT-500 I had.
>
> Ron, N9RC
>
>

Hi Ron,

Thanks for your reply!

Which kind of band decoder are you using? How did you connect your K3 with the 2KL? I guess with a single cable from the key out (K3) to the T/R control terminal, right? I´m a bit scared of harming the K3 or 2KL, because of wrong connections. Is there anything else I have to think of?

I´m also using the AT 500 tuner and I sometimes have problems too. Sometimes the tuner does not want to tune at all, so I use a little trick. I engage the internal IC 761 tuner and then the AT500 starts tuning. I turn the internal tuner off and everything works fine.

73, Chris-OE5CSP
--
Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger

--

View this message in context: http://n2.nabble.com/K3-and-IC--2KL--negative-voltage-modification-tp1617415p1621971.html

Sent from the Elecraft mailing list archive at Nabble.com.

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[OE5CSP-Chris]

I got many different opinions on this topic and it seems that the IC-2KL really needs negative ALC for a good protection.I´ll do the modification in order not to damage the amp.Thanks for your comments!

73, Chris-OE5CSP

[DC1RS]

I would be also very interested in the interface you will use for band switching of the 2KL.
I use an AT500 tuner and I'd like to do the bandswitching from the K3, but i couldn't find any
decoders in the web.

73 de Roland, DC1RS

Ron N9RC wrote

I use the K3 with a 2KL.  I have the parts for auto band switching (decade band info convertor) but have yet to build it.  The max power setting I use is 25 watts for 500 watts out but have to watch the K3 power closely.  The 2KL trips out easily when over driven and depending on band, mode and antenna SWR (worst case 1.5:1) I have to reduce the K3 power to as much as 12 watts to avoid trips.  I believe the K3 "may" have  a power spike on first sylable that causes some of the trips.  I do not use ALC but as things settle I may try it.  I use the MFJ 600 watt auto tuner with the 2KL and generally it works quite well.  I was not happy with a AT-500 I had.

Ron, N9RC

[gdaught6]

Roland wrote...

> I would be also very interested in the interface you will use for band
> switching of the 2KL.
> I use an AT500 tuner and I'd like to do the bandswitching from the K3, but i
> couldn't find any
> decoders in the web.

I built one to switch my 2KL/AT500 from a Yaesu FT1000MP MkV Field.  All I had
to do to make it work with my K3 was to change the plug on the radio end, and steal
some 12VDC power from the jack on the back of the K3 [The Yaesu had power
available on the accessory jack.]  I can come up with a schematic and parts list if
anyone is interested.

vy 73,

George T Daughters, K6GT
CU in the California QSO Party (CQP)
October 3-4, 2009


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[Andreas Junge]

Roland,

There are two pieces you need:

BCD to individual band decoder:

http://www.unifiedmicro.com/decoder.html

And the voltage divider to generate the voltages per band:

http://www.qth.com/topten/apnote3.htm

I hope this helps,

Andreas, N6NU
Menlo Park, CA

> -----Original Message-----
> From: [hidden email] [mailto:elecraft-
> [hidden email]] On Behalf Of DC1RS
> Sent: Monday, December 15, 2008 1:23 PM
> To: [hidden email]
> Subject: Re: [Elecraft] K3 and IC- 2KL; negative voltage modification
>
>
> I would be also very interested in the interface you will use for band
> switching of the 2KL.
> I use an AT500 tuner and I'd like to do the bandswitching from the K3, but
> i
> couldn't find any
> decoders in the web.
>
> 73 de Roland, DC1RS
>
>
> Ron N9RC wrote:
> >
> > I use the K3 with a 2KL.  I have the parts for auto band switching
> (decade
> > band info convertor) but have yet to build it.  The max power setting I
> > use is 25 watts for 500 watts out but have to watch the K3 power
> closely.
> > The 2KL trips out easily when over driven and depending on band, mode
> and
> > antenna SWR (worst case 1.5:1) I have to reduce the K3 power to as much
> as
> > 12 watts to avoid trips.  I believe the K3 "may" have  a power spike on
> > first sylable that causes some of the trips.  I do not use ALC but as
> > things settle I may try it.  I use the MFJ 600 watt auto tuner with the
> > 2KL and generally it works quite well.  I was not happy with a AT-500 I
> > had.
> >
> > Ron, N9RC
> >
> >
> >
>
> --
> View this message in context: http://n2.nabble.com/K3-and-IC--2KL--
> negative-voltage-modification-tp1617415p1660062.html
> Sent from the Elecraft mailing list archive at Nabble.com.
>
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[Len, K3LJ]

I would be interested also in seeing how you did the interface.

Thanks George,   Len  K3LJ

gdaught6 wrote

Roland wrote...

> I would be also very interested in the interface you will use for band
> switching of the 2KL.
> I use an AT500 tuner and I'd like to do the bandswitching from the K3, but i
> couldn't find any
> decoders in the web.

I built one to switch my 2KL/AT500 from a Yaesu FT1000MP MkV Field.  All I had
to do to make it work with my K3 was to change the plug on the radio end, and steal
some 12VDC power from the jack on the back of the K3 [The Yaesu had power
available on the accessory jack.]  I can come up with a schematic and parts list if
anyone is interested.

vy 73,

George T Daughters, K6GT
CU in the California QSO Party (CQP)
October 3-4, 2009


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[DC1RS]

Andreas,
thank you very much for the links. Now I got an idea how to build the interface :)


George,
despite the links Andreas posted, I would be also interested in your solution, just to get a different point of view.

73 de Roland, DC1RS

[Bjorn]

On 5 dec 2008, at 13.56, Ron N9RC wrote:

> I believe the K3 "may" have  a power spike on
> first sylable that causes some of the trips.  I do not use ALC but  
> as things
> settle I may try it.  I use the MFJ 600 watt auto tuner with the 2KL  
> and
> generally it works quite well.  I was not happy with a AT-500 I had.

I was also of the firm opinion not to use ALC, but as my K3's power  
output fluctuates a lot in SSB and sometimes for no reason also trips  
the amps in CW I have ordered the ALC mod to make sure I protect the  
amp.

When I set power for 50 watts output and confirm this power level with  
"TUNE", I easily get 65+ watts on SSB within a few seconds after  
keying up and start talking. Then slowly the power settles down to the  
set level or even below. I will do the mod and hook up ALC as a safe  
guard and keep it that way until Elecraft finds a solution to my (and  
others) fluctuating power problem.

73 de Björn,
SM0MDG
SE0X





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